JPH1114267A - Structure of stud - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow the mounting of a ceramic cap to the leading end of a stud to be easy and quick, by aligning and fitting the passage of the projected part of the ceramic cap with the projected part of the stud body, and then rotating the passage of the projected part of the ceramic cap to a required angle so as to allow a pair of the projected parts to enter the recessed part for storing the projected parts, and to fix them in such a manner that they can not be drawn out. SOLUTION: On the peripheral surface of the distal end of the leading end 1a of a stud body, which is mounted by being threaded into a nut member that is welded to the inner surface of the iron skin of a furnace, or deposited to the inner surface of the iron skin, the projected parts 3 are provided by being fixed to a diametrically symmetrical positions by welding 4. The passage 5 of the projected part on the inner surface of the ceramic cap 2 is fitted in alignment with the positions of those projected parts 3. When the predetermined fitting depth is reached, the passage 5 of the projected part is rotated to a required angle at that point, so as to allow each projected part 3 to enter the recessed part 6 for storing the projected parts. Therefore, the ceramic cap 2 can be mounted to the leading end 1a of the stud body in such a manner that it can not be drawn out, so that a fixed bearing power can be maintained without causing any variations in the height of the stud.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stud for supporting an amorphous refractory for lining of various industrial kilns on a steel shell, and more particularly to a stud structure having a ceramic cap.

[0002]

2. Description of the Related Art In various types of industrial kilns, when a refractory, particularly a castable, is formed on the inner surface of a steel shell of the furnace, for example, a Y-shaped stud is attached to the steel shell to form an anchor. Is prevented from peeling off.

The above-mentioned stud is generally formed of a heat-resistant metal. However, when the temperature exceeds 1200 ° C., the tensile strength sharply decreases and the castable support force is lost. Therefore, as shown in FIG. Ceramic caps b, b are screwed over the tip of a by screw c to prevent the tip of the stud body a from being directly exposed to high temperature, and to prevent the stud body a from deteriorating, thereby maintaining the supporting force. Like that.

[0004]

However, in the above-mentioned conventional structure, not only is it extremely troublesome to screw the ceramic caps b, b into the stud body a, but also the screwing depth of the ceramic caps b, b. Is not constant, the height of the stud body a varies, and the support force of the castable is not constant.
There is also a problem that the ceramic caps b, b are broken if the ceramic caps b, b are screwed too much.

[0005]

SUMMARY OF THE INVENTION The present invention makes it possible to easily and quickly attach a ceramic cap to the tip of a metal stud, does not cause cracking of the ceramic cap, and varies the height of the stud. It is an object of the present invention to maintain a constant supporting force without causing a problem.

[0006] As means for solving the above problems, the present invention provides:
At least a pair of protrusions projecting in the radial direction are provided at the tip of the metal stud body, and the protrusion fits and passes through the inner periphery of the ceramic cap fitted to the tip of the stud body. And a convex storage recess connected to the inner end thereof and extending in the circumferential direction so as to be able to receive the convex, and the convex passage of the ceramic cap is fitted to the convex of the stud body. The projection is rotated by a required angle after the combination, so that the projection enters the projection storage recess and is fixed so that it cannot be pulled out.

With the above arrangement, the convex portion of the inner surface of the ceramic cap is inserted in accordance with the convex portion of the stud, and the convex portion is fitted into the concave portion of the convex portion and cannot be pulled out simply by rotating when it abuts. Since it can be mounted, quick mounting is possible, and the fitting depth of the ceramic cap is determined by the fitting position between the convex portion and the concave portion, so that the stud height does not vary.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 shows an example of a stud body 1 of a stud according to the present invention, and FIG. 3 shows an enlarged cross-section of a part of a ceramic cap 2 fitted to a tip end of the stud body 1. 1
Is formed of a round bar-shaped metal material having high heat resistance, and the figure illustrates a case of a Y-shaped stud. As the constituent material of the ceramic cap 2, clay, high alumina, zirconia, silicon nitride, silicon carbide, or the like is used.

As shown in FIG. 2 in an enlarged view taken along line AA of FIG. 2, convex portions 3 and 3 are welded to the peripheral surface of the distal end portion 1a of the stud body 1 at symmetrical positions on the diameter line. It is provided fixedly.

As shown in FIG. 3, the ceramic cap 2 has a cylindrical shape with its tip 2a sealed, and the protrusions 3, 3 of the stud body 1 extend in the axial direction over a required length from its open end. The convex passages 5 and 5 are formed so as to be aligned with and fit as closely as possible. The convex storage recesses into which the convex portions 3 and 3 can enter are located at the inner end positions of these convex passages 5 and 5. 6
Are formed continuously (may be intermittent) in the circumferential direction.

Next, the operation of the above embodiment will be described.

At the tip 1a of the stud body 1, which is attached by screwing to a nut member welded to the inner surface of the furnace shell or welded to the inner surface of the shell, convex passages 5, 5 on the inner surface of the ceramic cap 2 are provided. When the fitting is performed in accordance with the position of the projections 3 and 3 of the tip portion 1a of the stud body 1 and reaches a predetermined fitting depth, the projections 3 and 3 reach a dead end. The protrusions 3 and 3 enter the protrusion storage recesses 6 and 6, whereby the ceramic cap 2 is attached to the tip 1 a of the stud body 1 so that it cannot be pulled out.

Therefore, when the ceramic cap 2 is mounted, the mounting is completed only by fitting the ceramic cap 2 to the tip 1a of the stud body 1 and turning it. Even if it is present, the mounting operation can be performed efficiently.

FIG. 6 shows the tip portions 1a of the stud body 1.
In this modification, the positions of the convex portions 3 provided in the ceramic cap 2 are not at the end positions of the tip portions 1a, 1a but at intermediate positions, and the positions of the convex storage recesses 6 formed on the inner surface of the ceramic cap 2 are also adjusted to the positions. In this embodiment, the procedure for attaching the ceramic cap 2 can be performed in exactly the same manner as in the above embodiment.

The form of the stud is not limited to the Y-shape, and the stud can be similarly formed in a V-shape or an L-shape. Also, the convex portions 3, 3 are three, 4
In this case, the ceramic cap 2
Are provided correspondingly.

[0016]

As described above, according to the present invention, the ceramic cap can be mounted by merely rotating the ceramic cap after fitting the ceramic cap to the tip of the stud body. And work efficiency can be greatly improved. In addition, since the fitting depth of the ceramic cap is fixed, the height of the stud can be made uniform, the support of the refractory (castable) by the stud can be stabilized, and the ceramic cap is broken at the time of mounting. Such a risk can be completely eliminated.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a stud body of a stud according to the present invention.

FIG. 2 is an enlarged view taken along the line AA of FIG. 1;

FIG. 3 is a partially cutaway sectional view showing an example of a ceramic cap of a stud according to the present invention.

FIG. 4 is a sectional view corresponding to the view taken in the direction of arrows BB in FIG. 3;

FIG. 5 is a cross-sectional view corresponding to the direction of arrows CC in FIG.

FIG. 6 is a front view showing a modification of the stud body.

FIG. 7 is a sectional view of a ceramic cap used for the stud body of FIG. 6;

FIG. 8 is a front view showing a cross section of a ceramic cap of a conventional stud with a ceramic cap.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stud main body 1a Tip 2 Ceramic cap 3 Convex 5 Convex passage 6 Convex recess

Claims (1)

[Claims] At least one pair of projections projecting in the radial direction is provided at the tip of a metal stud body, and the projection is formed on the inner periphery of a ceramic cap fitted to the tip of the stud body. A convex passage that can fit and pass therethrough, and a convex housing recess that is continuous with the inner end and extends in the circumferential direction so as to be able to receive the convex, are formed, and the convex passage of the ceramic cap is formed by the convex of the stud body. The stud structure is characterized in that the projections are rotated by a required angle after being fitted and fitted to the projections, so that the projections enter the projection storage recesses and are fixed so that they cannot be pulled out.